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SSD comparison · Updated May 14, 2026

WD_BLACK SN850X 1TB vs WD_BLACK SN7100 2TB

Compare WD_BLACK SN850X 1TB and WD_BLACK SN7100 2TB: prices, speeds, $/TB. Which to buy in May 2026? Full spec breakdown.

WD_BLACK SN850X 1TB Gen 4

WD · WD G2
$119
$119.00/TB
View on Amazon →

WD_BLACK SN7100 2TB Gen 4

WD · SanDisk A101
$165
$82.50/TB
View on Amazon →
Generation
Gen 4
Gen 4
Price (USD)
$119
$165
Capacity
1 TB
2 TB
$/TB
$119.00
$82.50
Sequential read
7,300 MB/s
7,250 MB/s
Sequential write
6,300 MB/s
6,900 MB/s
Interface
PCIe 4.0 x4
PCIe 4.0 x4
Controller
WD G2
SanDisk A101
DRAM cache
Yes
No (HMB)
TBW endurance
600 TBW
1,200 TBW
Warranty
5 years
5 years
PS5 compatible
Yes
Yes

Verdict: WD_BLACK SN850X 1TB vs WD_BLACK SN7100 2TB

Both run on Gen 4 hardware but at different capacities: 1 TB for the WD_BLACK SN850X 1TB versus 2 TB for the WD_BLACK SN7100 2TB. Whether the larger drive's $/TB advantage justifies the higher upfront cost depends on how much you actually need.

Hardware-wise, the WD_BLACK SN850X 1TB runs on WD's second-generation G2 in-house controller, tuned for sustained gaming I/O. The WD_BLACK SN7100 2TB pairs SanDisk's A101 controller, used in newer WD_BLACK SKUs after the SanDisk spinoff.

Price separates these two meaningfully. The WD_BLACK SN7100 2TB costs $82.50/TB versus $119.00/TB for the WD_BLACK SN850X 1TB — a 31% premium that needs justification in real benchmarks, not just spec-sheet bragging.

The WD_BLACK SN850X 1TB carries a dedicated DRAM chip for FTL (Flash Translation Layer) mapping; the WD_BLACK SN7100 2TB relies on HMB (Host Memory Buffer), borrowing 64 MB from system RAM. The practical gap shows up only under sustained random write loads.

On warranty endurance the WD_BLACK SN7100 2TB carries 1,200 TBW against WD_BLACK SN850X 1TB's 600 TBW. Both will outlast typical use, but the gap matters if you're doing professional content work.

Real-world use cases

For PlayStation 5 builds, the console's internal M.2 slot tops out around 5,500 MB/s sustained, so both WD_BLACK SN850X 1TB and WD_BLACK SN7100 2TB hit the same wall — pick whichever is cheaper at the moment you buy. Heavy write workloads — video editing, RAW photo libraries, backup operations — favor the WD_BLACK SN7100 2TB's 6,900 MB/s sustained write speed. Both drives use the 2280 form factor, which is too long for Steam Deck or ROG Ally — you'd need a 2230 variant if either manufacturer offers one, or a dedicated handheld-format drive instead.

Pick the WD_BLACK SN850X 1TB if...

Pick the WD_BLACK SN850X 1TB if you value the lower retail price ($119 vs $165), and a dedicated DRAM cache chip. The SN850X has been the best-selling Gen 4 NVMe in PCPartPicker builds for two consecutive years — Game Mode 2.0 prioritizes I/O when supported titles need it.

Pick the WD_BLACK SN7100 2TB if...

Pick the WD_BLACK SN7100 2TB if you value better $/TB economics ($82.50/TB), and a higher TBW endurance rating (1,200 TBW).

Best value for money

WD_BLACK SN7100 2TB
Lowest $/TB in this matchup: $82.50/TB

Best for gaming

WD_BLACK SN7100 2TB
7,250 MB/s read at $82.50/TB, PS5-compatible

Best for content creators

WD_BLACK SN850X 1TB
Sustained 6,300 MB/s writes with dedicated DRAM, 600 TBW endurance

Best for PS5

WD_BLACK SN7100 2TB
PCIe Gen 4 NVMe at $82.50/TB — best PS5 expansion value here
FAQ

WD_BLACK SN850X 1TB vs WD_BLACK SN7100 2TB — common questions

Which is cheaper, the WD_BLACK SN850X 1TB or WD_BLACK SN7100 2TB?

As of May 14, 2026, the WD_BLACK SN7100 2TB sits at $165 ($82.50/TB) on Amazon, versus $119 ($119.00/TB) for the WD_BLACK SN850X 1TB. SSD pricing has been volatile during the 2026 NAND shortage — verify current Amazon prices via the buy links above before purchasing.

What are the read and write speed differences?

Sequential read: WD_BLACK SN850X 1TB hits 7,300 MB/s, WD_BLACK SN7100 2TB hits 7,250 MB/s. Sequential write: WD_BLACK SN850X 1TB at 6,300 MB/s, WD_BLACK SN7100 2TB at 6,900 MB/s. Random performance is more relevant for daily use, and both drives perform similarly there for typical consumer workloads.

Is the WD_BLACK SN850X 1TB or WD_BLACK SN7100 2TB better for PS5?

Both are PCIe Gen 4 NVMe M.2 2280 — both meet Sony's expansion requirements. The PS5's M.2 controller caps sustained speeds at ~5,500 MB/s, so both drives saturate it equally. Pick on price — the WD_BLACK SN7100 2TB at $82.50/TB is the better value. Add a heatsink (the PS5 cover provides minimal cooling) for thermal headroom.

Should I pay more for the DRAM in the WD_BLACK SN850X 1TB?

Only if your workload includes sustained random writes — databases, source-code compilation against large repos, 4K-and-up video editing on long projects. For the majority of consumer use, the DRAM-less WD_BLACK SN7100 2TB performs identically while saving money.

Which has better endurance, the WD_BLACK SN850X 1TB or WD_BLACK SN7100 2TB?

The WD_BLACK SN7100 2TB carries the higher rating: 1,200 TBW versus 600 TBW on the WD_BLACK SN850X 1TB. For typical consumer use this rarely matters — even 600 TBW takes 10+ years of normal writes to consume. Content creators writing 50+ GB daily should weight TBW more heavily.

Which should I buy in May 2026, WD_BLACK SN850X 1TB or WD_BLACK SN7100 2TB?

For most buyers, the WD_BLACK SN7100 2TB wins this matchup — it balances Gen 4 performance, $82.50/TB pricing, and proven reliability. Pick the WD_BLACK SN850X 1TB only if you specifically need its faster sequential reads.

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